| 摘要 |
PROBLEM TO BE SOLVED: To provide an underground anchor which can be buried even in the hard ground by rotatively excavating the ground and entering into the ground by the use of a small-sized rotary machine. SOLUTION: This underground anchor, the spiral excavating blade of which is provided on the leading-end side of a supporting rod, is buried in the ground while rotatably penetrating the ground. In the underground anchor, the spiral excavating blades are intermittently provided in the axial direction of the supporting rod; a rotatively-entry-direction leading end of each spiral excavating blade is acutely formed; the diameter of the spiral excavating blade is made gradually larger in the back end direction of the supporting rod from the leading end of the supporting rod; and the pitch of a spiral of each spiral excavating blade is made gradually larger in the back end direction of the supporting rod from the leading end of the supporting rod. In addition, desirably, the rotatively-entry-direction leading end and the outer peripheral edge of each spiral excavating blade are acutely formed. COPYRIGHT: (C)2007,JPO&INPIT
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